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Finding the Fourth Proportional to 87,812.70, 131,411.85 and 80,439.90

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Solution

The fourth proportional to 87,812.70, 131,411.85 and 80,439.90 is: 120,378.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,812.70 : 131,411.85 = 80,439.90 : x
  2. Step 2: Convert to fraction form
    87,812.70/131,411.85 = 80,439.90/x
  3. Step 3: Cross multiply
    87,812.70x = 131,411.85 × 80,439.90
  4. Step 4: Simplify right side
    87,812.70x = 10,570,756,072.82
  5. Step 5: Solve for x
    x = 10,570,756,072.82/87,812.70
  6. Step 6: Final answer
    x = 120,378.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.